1,721,048 research outputs found
The study of CO2 natural reservoirs to develop criteria for risk assessment and safety strategy
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Assetto geologico e possibile sviluppo di fenomeni di sinkhole lungo la "linea Val Roveto-Atina".
No full textNew data on the late Quaternary tectonics in the epicentral area of the December 2013 - January 2014 southern Matese seismic sequence (Southern Apennines)
No full textNon-volcanic CO2 and CH4 degassing in an actively extending orogen, southern Apennines, Italy
No full textThe southern Apennines fold and thrust belt has been undergoing post-orogenic extension since ca. 700
kyr. Crustal extension controls active tectonics and seismogenesis in the mountain chain [1], with
seismicity being characterized by low to moderate magnitude events punctuated by strong earthquakes
[2]. Effective decoupling between deep and shallow structural levels is related to the strong rheological
contrast produced by a fluid-saturated, clay-rich mélange zone interposed between buried
autochthonous carbonates – continuous with those exposed in the Apulian foreland – and the
allochthonous units. This mélange zone also acts as a seal preventing the migration of deep-seated
aqueous fluids – as well as oil in the Basilicata region, which hosts the largest Europe’s onshore oil fields
– towards the surface.
On the other hand, the mountain belt is characterized by substantial gas flow, recorded as both
distributed soil gas emissions and vigorous gas vents, associated with active faults at the surface. We
measured a CO2 flux up to 34000 g/m-2 per day at a gas vent, as well as large amounts of He (up to 52
ppm), Rn (up to 228 kBq/m3) and CH4 (up to 5000 ppm).
Overpressured CO2, which has been proposed as triggering normal fault earthquakes in the Apennines,
has been interpreted as mostly of mantle origin. However, our new results from isotope analyses carried
out on the carbon contained in both CO2 and CH4 indicate a dominant thermogenic origin for these
gases, probably associated with the emplacement of magmatic sills within the lower section of the thick
carbonate platform succession occurring at the base of the sedimentary cover in the southern
Apennines. Our results bear major implication concerning the postulated occurrence of crustal faults
allowing fluids to migrate directly from mantle depths to the surface
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
The application of geospatial analysis for the construction of radon potential map of the Latium region based on geological variables, soil gas andindoor radon
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